kennedy



(No Model.) 2 Sheets-Sheet 1.

E. S. T. KENNEDY. ,RADIAL TUBE STEAM BOILER.

No. 375,324. Patented Dec. 20,1887.

.Httorney N. PETERS Pmm-Limu m nr. Washington. 110.

(N0 Mbd'el.) Y Y 2 Sheets-Sheet 2; E. S. T. KENNEDY.

EADIAL TUBE STEAM BOILER.

N0. 5375,32 4. Patented Dec. 20', 1887.

O O .0 21 0 0000000000 l O WITNESSES INVEJVTUR I 3 6606, 6, P I Jain Ewan)" Jaw/M1047 Attorney N. PETERS. Phololilhngmyhor, Walhiugtun, D. C.

UNITED STATES PATENT OFFICE.

ED\VARD S. T. KENNEDY, OF NEW YORK, N. Y.

RADIAL-TUBE STEAM-BOILER.

SPECIFICATION forming part of Letters Patent No. 375,324, dated December 20, 1887.

Application filed August 29, 1887. Serial No. 248210. (No model.)

To all whom it may concern:

Be it known that I, EDWARD S. T. KENNEDY, a citizen of the United States, residing at New York city, in the county ofNew York and State of New York, have invented certain new and useful Improvements in Radial-Tube Steam- Boilers; and Ido hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same. I

This invention relates to radial tube or porcupine steam-boilers of the kind having a central cylinder or stand-pipe provided with radial waterand steam tubes and surrounded by a deflecting furnace and shell having deflecting-plates at different heights above the fire-box. It also embraces certain improvements on the boilerdescribed in Letters Patent granted to me September 28, 1886, No. 349,720. V

The presentimprovements are more particularlyin details of construction ofthestand-pipe and its immediate attachments, whereby the boiler is made much more convenient,eft"ective, and durable in operation,a'nd whereby hot products of combustion are more evenly and uniformly distributed around and between all the tubes of the boiler, aroundthe entire circumference of the stand-pipe, and injurious heatcurrents in any one line are avoided, and consequently the wear upon the tubes made uniform.

In making boilers of large size with standpipes of from twenty to forty-eight inches diameter,o-r more, the vertical riveted seams,necessarily used for joining the edges of the iron plate to make the cylinder, interfered with the regular spacing and setting of the radial tubes, and an extra wide space was necessarily left between the tubes along the line of this vertical seam. The seam extended from bottom to top of the standpipe, and thus formed a direct fine-space, up which currents of flame and heated products would draw with great vigor, heating the tubes on either side to excess and causing their rapid destruction, as the water was apt to be driven out of them by the detrimentally-high heat, while of course the heat was drawn away from other tubes and they did not properly perform their function or do their share ofservice. Tubes along the seam and flue-space looked as though they had been heated red-hot and injured, while other tubes looked as if they had never been heated; Uneven circulation of water and diminished steaming capacity resulted from this defective construction. In order to overcome these defects and objections, I construct the stand-pipe of short cylindrical sections and rivet these sections together, so that their vertical seams shall be turned one from the other successively from left to right from one quarter to one-third or one-half the circumference of the stand-pipe, and I prefer that they shall be one-quarter the circumference one from the other, so that four seams in four successive sections shall complete the circle ofthe standpipe. I do not, however, confine myself to any particular number of sections, as the number will depend upon the height of the standpipe. Short seams and spaces are thus made, and above each space the tubes are set in close regular order, and the heat thus uniformly distributed. The hot products that pass up one short flue-space come in contact with the close-set tubes above, where much of their heat is absorbed before they reach another fiue-space, and the operation is repeated to the top of the boiler.

Myinvention embraces other features ofconstruetion, which will be pointed out in the detail description, referring by letter to the drawings, and the matter constituting my invention will be defined in the claims.-

In the accompanying drawings, Figure 1 represents a vertical section of my radial-tube or porcupine boiler properlysetin its furnace. Fig. 2 represents a detached perspective view of the standpipe, with parts broken away, and showing the cylindrical sections with vertical seams arranged at quarter-arcs one from the other. Fig. 3 represents an enlarged detail view of the base of furnace and stand-pipe.

The furnace and shell A of the boiler are built of brick and lined a sufficient height with fire-brick mounted upon a foundation, W. The shell is provided with numerous sight-openings and doorsu, and is surmounted by a suitable hood and smoke-stack. A firechamber, 0, and an ash-pit, D, are provided in the lower part of the furnace-walls, and

the fire-chamber is provided near its top with brick-deflector c, as shown. Iron deflectingplates 0' project inward at different heights from the walls above.

The stand-pipe B is composed of cylindrical sections 1 2 3 4, &c., asshown. Itis provided with a flanged and dished lower head, I, riveted to the cylindrical portion, and the walls ofthe cylinder extend down and rest upon the circular cast-iron foundation-plate i, which is located upon the supplementary brick foundation n, composed of one course of brick, which prevents water in the ash-pit from com ing in contact with the iron of boiler. The inclined brick 0 protects the iron sill of the door-frame and makes removalof ashes more convenient. The usual fire and ash doors, a a, are provided.

By reference to Fig. 2 the short cylindrical sections 1 234 50f thestand-pipe may beseen, with their vertical riveted seams N, i, N", N, and arranged at quarter-ares of the circumference of the cylinders one from the other successively from left to right. As shown by the holes, the tubes are inserted in close order, with regular spaces above and below, so that-the fiuespaces made by the tubes on each side of the seams extend but a short distance, and that hot products are therefore well distributed around the entire circumference of thestand-pipe and in contact with all the tubes. The stand-pipe has secured in it the wroughtmetal tubes I), having the metal at their outer ends closed and welded upon itself, so as to form a seamless hemispherical end of thickened metal possessing great strength and durability. These tubes are protected by a separate Patent granted to me August 23,1887, No. 368,836. The stand-pipe at top is provided with a peculiar arrangement of steamdrying tubes and steam discharge pipe, claimed in another Patent, N 0. 310,891, J anrr ary 20, 1885. The lower end of thestand-pipe forms a mud-drum, L, (see Fig. 3,) which receives the sediment from the currents of circulating water above, and is provided with a man-hole, K, and properly-secured plate K, having handle Z. This man-hole affords access to the stand-pipe for expanding the tubes in their holes and afterward for inspecting the tubes and cleaning them and the standpipe and removing deposits from the muddrum. The feed-pipe 10 connects with the stand-p pe just below the grate, and extends out through the brick wall of the furnace. The blow-off pipeg passes into the standpipc just below the grate, and its inner end is bent down to near the bottom of the mud-drum. At a suitable height above the floor of the ash-pit a ledge, d, is formed in the brick furnace-wall and covered by a east-iron plate, and at the same height the stand-pipe has riveted to it the wrought-iron brackets 72, which support the wrought-iron ring H. This ring is sufficiently large to set out from the stand-pipe and leave a clear annular space between the two, as shown in the drawings, for circulation of air, whereby burning and in jury of the stand-pipe by excessive heat at this point is prevented. The ledge and ring support the outer and inner ends,e e, of grate bars E. The grate-surface is circular in form, and in large boilers extends entirely around the stand-pipe. The water-column pipe w connects below the grate with stand-pipe, and at the junction of the horizontal and vertical portion is connected a three-way valve, t, from which leads a discharge-pipe, as, into the ashpit.

Having described my invention, what I claim, and desire to secure by Letters Patent, 1s-

1. In a radial-tube boiler, the stand-pipe composed of cylindrical sections having their vertical riveted seams in adjacent sections placed at lateral intervals one from the other amounting to from one-fourth to one-halfofthe circumference of the cylinders, as and for the purpose described.

2. In a radial-tube boiler, the standpipe composed of short cylindrical sections riveted together in such manner that the vertical riveted seams of adjacent sections shall extend in different vertical lines at suitable distances apart, whereby the radial tubes may be arranged and spaced in the successive sections, so as to divert and distribute the heated currents around the stand-pipe.

3. In a radial-tube boiler, the stand-pipe composed of short cylindrical sections connected together, and the vertical seams of adjacent sections placed at quarter-arcs of the circumference distant one from the another, as and for the purpose described. I

4. In combination with a stand-pipe resting upon the floor of the ash pit, the brackets h, riveted thereto, and ring H, of larger diameter than the stand-pipe, so as to provide an annular space between the two,and resting on the brackets for supporting the inner ends of the grate-bars.

5. In combination with a radial-tube boiler, the furnace-walls having a ledge, d, at the top of the ash-pit, the brackets h, riveted to the stamtpipe, and ring H, of larger diameter than the standpipe, resting on the brackets for supporting the circular grate.

6. In combination with a radial-tube boiler, the central supplementary brick foundation rising above the floor of the ash-pit, and foundation-plate i,for supporting the lower end of the stand-pipe above the floor of the ash-pit and preventing injury thereof by water on the ash-pit floor.

In testimony whereof I affix my signature in presence of two witnesses.

EDXV ARI) S. T. KENNEDY.

\Vitncsses:

JOHN H. WILLIAMsON, WM. T. KENXEDY. 

